'back-bent occlusion' can also refer to...

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An occlusion where the motion of the front reverses, being carried westwards or southwards (in the northern hemisphere) by the flow behind the cold front. This occurs either with the development of a secondary depression near the triple point or through motion of the main low-pressure centre eastwards along the front.

Back-bent occlusion The extended occluded front in this depression is being carried southwards by the flow around the main low-pressure centre (999 hPa), and a secondary centre (1000 hPA) is beginning to develop.